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=Mechanics Rotator Cuff= The Rotator Cuff has four major muscles Supraspinatus, Infraspinatus, Teres minor and the Subscapularis. The three bones that are attached to the four Rotator Cuff tendons is the clavicle, scapula and the head of the humerus .The Supraspinatus muscle stabilizes the head of the humerus in the glenoid fossa and it allows the arm to abduct. The Infraspinatus and the Teres minor are responsible for external rotators combined with the posterior deltoid and horizontal extensions. The Subscapularis can move the arm internally, adduction and extension position. When performing daily activities such as cleaning, lifting, reaching or playing sports, injuries can occur. Injuries are more common in young athletes and or elderly from overuse of the muscles and or weakness. Repetitions of the over head exercises without a proper warm up or a poor technique can cause problems in the rotator cuff. Most common injuries that occur in the Rotator Cuff are Rotator Cuff Impingement Syndrome, Shoulder Musculoskeletal Disorder (MSD) and or Shoulder tendonitis and Rotator Cuff Tear. The Shoulder Musculoskeletal Disorder (MSD) and or Rotator Cuff Tendonitis (trauma) occurs when there is over use of the muscle without any rest in between which causes the muscle to become weak and shoulder pain occurs. The Impingement injuries occur when one of the tendons get trapped between the bones of the shoulder joint. The overuse of this injury can lead to inflammation of the Bursa known as Bursitis and or inflammation of the tendon known as tendonitis can lead to rotator cuff injuries. A tear in any of the tendons attach to the head of the humerus may cause pain, weakness or loss of movement in the rotator cuff. Rehabilitation is mandatory in order for the muscles to gain their full strength and endurance back. The Rotator Cuff Tears usually occur when the inflammation of Bursa in the tendon shear with the Acromion cause’s tears and or pain. Once the tendon tears, there is severe pain in the Rotator Cuff because the tendons aren’t attached to the head of the humerus anymore. It’s extremely important to see a doctor after Rotator Cuff injury in order to avoid a tendon tear because it may lead to surgery.